1 files changed, 642 insertions, 0 deletions

diff --git a/drivers/usb/wusbcore/security.c b/drivers/usb/wusbcore/security.c
new file mode 100644
index 00000000000..a101cad6a8d
--- /dev/null
+++ b/drivers/usb/wusbcore/security.c
@@ -0,0 +1,642 @@
+/*
+ * Wireless USB Host Controller
+ * Security support: encryption enablement, etc
+ *
+ * Copyright (C) 2006 Intel Corporation
+ * Inaky Perez-Gonzalez <inaky.perez-gonzalez@intel.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License version
+ * 2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+ * 02110-1301, USA.
+ *
+ *
+ * FIXME: docs
+ */
+#include <linux/types.h>
+#include <linux/usb/ch9.h>
+#include <linux/random.h>
+#include "wusbhc.h"
+
+/*
+ * DEBUG & SECURITY WARNING!!!!
+ *
+ * If you enable this past 1, the debug code will weaken the
+ * cryptographic safety of the system (on purpose, for debugging).
+ *
+ * Weaken means:
+ *   we print secret keys and intermediate values all the way,
+ */
+#undef D_LOCAL
+#define D_LOCAL 2
+#include <linux/uwb/debug.h>
+
+static void wusbhc_set_gtk_callback(struct urb *urb);
+static void wusbhc_gtk_rekey_done_work(struct work_struct *work);
+
+int wusbhc_sec_create(struct wusbhc *wusbhc)
+{
+        wusbhc->gtk.descr.bLength = sizeof(wusbhc->gtk.descr) + sizeof(wusbhc->gtk.data);
+        wusbhc->gtk.descr.bDescriptorType = USB_DT_KEY;
+        wusbhc->gtk.descr.bReserved = 0;
+
+        wusbhc->gtk_index = wusb_key_index(0, WUSB_KEY_INDEX_TYPE_GTK,
+                                           WUSB_KEY_INDEX_ORIGINATOR_HOST);
+
+        INIT_WORK(&wusbhc->gtk_rekey_done_work, wusbhc_gtk_rekey_done_work);
+
+        return 0;
+}
+
+
+/* Called when the HC is destroyed */
+void wusbhc_sec_destroy(struct wusbhc *wusbhc)
+{
+}
+
+
+/**
+ * wusbhc_next_tkid - generate a new, currently unused, TKID
+ * @wusbhc:   the WUSB host controller
+ * @wusb_dev: the device whose PTK the TKID is for
+ *            (or NULL for a TKID for a GTK)
+ *
+ * The generated TKID consist of two parts: the device's authenicated
+ * address (or 0 or a GTK); and an incrementing number.  This ensures
+ * that TKIDs cannot be shared between devices and by the time the
+ * incrementing number wraps around the older TKIDs will no longer be
+ * in use (a maximum of two keys may be active at any one time).
+ */
+static u32 wusbhc_next_tkid(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
+{
+        u32 *tkid;
+        u32 addr;
+
+        if (wusb_dev == NULL) {
+                tkid = &wusbhc->gtk_tkid;
+                addr = 0;
+        } else {
+                tkid = &wusb_port_by_idx(wusbhc, wusb_dev->port_idx)->ptk_tkid;
+                addr = wusb_dev->addr & 0x7f;
+        }
+
+        *tkid = (addr << 8) | ((*tkid + 1) & 0xff);
+
+        return *tkid;
+}
+
+static void wusbhc_generate_gtk(struct wusbhc *wusbhc)
+{
+        const size_t key_size = sizeof(wusbhc->gtk.data);
+        u32 tkid;
+
+        tkid = wusbhc_next_tkid(wusbhc, NULL);
+
+        wusbhc->gtk.descr.tTKID[0] = (tkid >>  0) & 0xff;
+        wusbhc->gtk.descr.tTKID[1] = (tkid >>  8) & 0xff;
+        wusbhc->gtk.descr.tTKID[2] = (tkid >> 16) & 0xff;
+
+        get_random_bytes(wusbhc->gtk.descr.bKeyData, key_size);
+}
+
+/**
+ * wusbhc_sec_start - start the security management process
+ * @wusbhc: the WUSB host controller
+ *
+ * Generate and set an initial GTK on the host controller.
+ *
+ * Called when the HC is started.
+ */
+int wusbhc_sec_start(struct wusbhc *wusbhc)
+{
+        const size_t key_size = sizeof(wusbhc->gtk.data);
+        int result;
+
+        wusbhc_generate_gtk(wusbhc);
+
+        result = wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid,
+                                 &wusbhc->gtk.descr.bKeyData, key_size);
+        if (result < 0)
+                dev_err(wusbhc->dev, "cannot set GTK for the host: %d\n",
+                        result);
+
+        return result;
+}
+
+/**
+ * wusbhc_sec_stop - stop the security management process
+ * @wusbhc: the WUSB host controller
+ *
+ * Wait for any pending GTK rekeys to stop.
+ */
+void wusbhc_sec_stop(struct wusbhc *wusbhc)
+{
+        cancel_work_sync(&wusbhc->gtk_rekey_done_work);
+}
+
+
+/** @returns encryption type name */
+const char *wusb_et_name(u8 x)
+{
+        switch (x) {
+        case USB_ENC_TYPE_UNSECURE:     return "unsecure";
+        case USB_ENC_TYPE_WIRED:        return "wired";
+        case USB_ENC_TYPE_CCM_1:        return "CCM-1";
+        case USB_ENC_TYPE_RSA_1:        return "RSA-1";
+        default:                        return "unknown";
+        }
+}
+EXPORT_SYMBOL_GPL(wusb_et_name);
+
+/*
+ * Set the device encryption method
+ *
+ * We tell the device which encryption method to use; we do this when
+ * setting up the device's security.
+ */
+static int wusb_dev_set_encryption(struct usb_device *usb_dev, int value)
+{
+        int result;
+        struct device *dev = &usb_dev->dev;
+        struct wusb_dev *wusb_dev = usb_dev->wusb_dev;
+
+        if (value) {
+                value = wusb_dev->ccm1_etd.bEncryptionValue;
+        } else {
+                /* FIXME: should be wusb_dev->etd[UNSECURE].bEncryptionValue */
+                value = 0;
+        }
+        /* Set device's */
+        result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
+                        USB_REQ_SET_ENCRYPTION,
+                        USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+                        value, 0, NULL, 0, 1000 /* FIXME: arbitrary */);
+        if (result < 0)
+                dev_err(dev, "Can't set device's WUSB encryption to "
+                        "%s (value %d): %d\n",
+                        wusb_et_name(wusb_dev->ccm1_etd.bEncryptionType),
+                        wusb_dev->ccm1_etd.bEncryptionValue,  result);
+        return result;
+}
+
+/*
+ * Set the GTK to be used by a device.
+ *
+ * The device must be authenticated.
+ */
+static int wusb_dev_set_gtk(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev)
+{
+        struct usb_device *usb_dev = wusb_dev->usb_dev;
+
+        return usb_control_msg(
+                usb_dev, usb_sndctrlpipe(usb_dev, 0),
+                USB_REQ_SET_DESCRIPTOR,
+                USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+                USB_DT_KEY << 8 | wusbhc->gtk_index, 0,
+                &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength,
+                1000);
+}
+
+
+/* FIXME: prototype for adding security */
+int wusb_dev_sec_add(struct wusbhc *wusbhc,
+                     struct usb_device *usb_dev, struct wusb_dev *wusb_dev)
+{
+        int result, bytes, secd_size;
+        struct device *dev = &usb_dev->dev;
+        struct usb_security_descriptor secd;
+        const struct usb_encryption_descriptor *etd, *ccm1_etd = NULL;
+        void *secd_buf;
+        const void *itr, *top;
+        char buf[64];
+
+        d_fnstart(3, dev, "(usb_dev %p, wusb_dev %p)\n", usb_dev, wusb_dev);
+        result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
+                                    0, &secd, sizeof(secd));
+        if (result < sizeof(secd)) {
+                dev_err(dev, "Can't read security descriptor or "
+                        "not enough data: %d\n", result);
+                goto error_secd;
+        }
+        secd_size = le16_to_cpu(secd.wTotalLength);
+        d_printf(5, dev, "got %d bytes of sec descriptor, total is %d\n",
+                 result, secd_size);
+        secd_buf = kmalloc(secd_size, GFP_KERNEL);
+        if (secd_buf == NULL) {
+                dev_err(dev, "Can't allocate space for security descriptors\n");
+                goto error_secd_alloc;
+        }
+        result = usb_get_descriptor(usb_dev, USB_DT_SECURITY,
+                                    0, secd_buf, secd_size);
+        if (result < secd_size) {
+                dev_err(dev, "Can't read security descriptor or "
+                        "not enough data: %d\n", result);
+                goto error_secd_all;
+        }
+        d_printf(5, dev, "got %d bytes of sec descriptors\n", result);
+        bytes = 0;
+        itr = secd_buf + sizeof(secd);
+        top = secd_buf + result;
+        while (itr < top) {
+                etd = itr;
+                if (top - itr < sizeof(*etd)) {
+                        dev_err(dev, "BUG: bad device security descriptor; "
+                                "not enough data (%zu vs %zu bytes left)\n",
+                                top - itr, sizeof(*etd));
+                        break;
+                }
+                if (etd->bLength < sizeof(*etd)) {
+                        dev_err(dev, "BUG: bad device encryption descriptor; "
+                                "descriptor is too short "
+                                "(%u vs %zu needed)\n",
+                                etd->bLength, sizeof(*etd));
+                        break;
+                }
+                itr += etd->bLength;
+                bytes += snprintf(buf + bytes, sizeof(buf) - bytes,
+                                  "%s (0x%02x/%02x) ",
+                                  wusb_et_name(etd->bEncryptionType),
+                                  etd->bEncryptionValue, etd->bAuthKeyIndex);
+                if (etd->bEncryptionType == USB_ENC_TYPE_CCM_1)
+                        ccm1_etd = etd;
+        }
+        /* This code only supports CCM1 as of now. */
+        /* FIXME: user has to choose which sec mode to use?
+         * In theory we want CCM */
+        if (ccm1_etd == NULL) {
+                dev_err(dev, "WUSB device doesn't support CCM1 encryption, "
+                        "can't use!\n");
+                result = -EINVAL;
+                goto error_no_ccm1;
+        }
+        wusb_dev->ccm1_etd = *ccm1_etd;
+        dev_info(dev, "supported encryption: %s; using %s (0x%02x/%02x)\n",
+                 buf, wusb_et_name(ccm1_etd->bEncryptionType),
+                 ccm1_etd->bEncryptionValue, ccm1_etd->bAuthKeyIndex);
+        result = 0;
+        kfree(secd_buf);
+out:
+        d_fnend(3, dev, "(usb_dev %p, wusb_dev %p) = %d\n",
+                usb_dev, wusb_dev, result);
+        return result;
+
+
+error_no_ccm1:
+error_secd_all:
+        kfree(secd_buf);
+error_secd_alloc:
+error_secd:
+        goto out;
+}
+
+void wusb_dev_sec_rm(struct wusb_dev *wusb_dev)
+{
+        /* Nothing so far */
+}
+
+static void hs_printk(unsigned level, struct device *dev,
+                      struct usb_handshake *hs)
+{
+        d_printf(level, dev,
+                 "  bMessageNumber: %u\n"
+                 "  bStatus:        %u\n"
+                 "  tTKID:          %02x %02x %02x\n"
+                 "  CDID:           %02x %02x %02x %02x %02x %02x %02x %02x\n"
+                 "                  %02x %02x %02x %02x %02x %02x %02x %02x\n"
+                 "  nonce:          %02x %02x %02x %02x %02x %02x %02x %02x\n"
+                 "                  %02x %02x %02x %02x %02x %02x %02x %02x\n"
+                 "  MIC:            %02x %02x %02x %02x %02x %02x %02x %02x\n",
+                 hs->bMessageNumber, hs->bStatus,
+                 hs->tTKID[2], hs->tTKID[1], hs->tTKID[0],
+                 hs->CDID[0], hs->CDID[1], hs->CDID[2], hs->CDID[3],
+                 hs->CDID[4], hs->CDID[5], hs->CDID[6], hs->CDID[7],
+                 hs->CDID[8], hs->CDID[9], hs->CDID[10], hs->CDID[11],
+                 hs->CDID[12], hs->CDID[13], hs->CDID[14], hs->CDID[15],
+                 hs->nonce[0], hs->nonce[1], hs->nonce[2], hs->nonce[3],
+                 hs->nonce[4], hs->nonce[5], hs->nonce[6], hs->nonce[7],
+                 hs->nonce[8], hs->nonce[9], hs->nonce[10], hs->nonce[11],
+                 hs->nonce[12], hs->nonce[13], hs->nonce[14], hs->nonce[15],
+                 hs->MIC[0], hs->MIC[1], hs->MIC[2], hs->MIC[3],
+                 hs->MIC[4], hs->MIC[5], hs->MIC[6], hs->MIC[7]);
+}
+
+/**
+ * Update the address of an unauthenticated WUSB device
+ *
+ * Once we have successfully authenticated, we take it to addr0 state
+ * and then to a normal address.
+ *
+ * Before the device's address (as known by it) was usb_dev->devnum |
+ * 0x80 (unauthenticated address). With this we update it to usb_dev->devnum.
+ */
+static int wusb_dev_update_address(struct wusbhc *wusbhc,
+                                   struct wusb_dev *wusb_dev)
+{
+        int result = -ENOMEM;
+        struct usb_device *usb_dev = wusb_dev->usb_dev;
+        struct device *dev = &usb_dev->dev;
+        u8 new_address = wusb_dev->addr & 0x7F;
+
+        /* Set address 0 */
+        result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
+                                 USB_REQ_SET_ADDRESS, 0,
+                                 0, 0, NULL, 0, 1000 /* FIXME: arbitrary */);
+        if (result < 0) {
+                dev_err(dev, "auth failed: can't set address 0: %d\n",
+                        result);
+                goto error_addr0;
+        }
+        result = wusb_set_dev_addr(wusbhc, wusb_dev, 0);
+        if (result < 0)
+                goto error_addr0;
+        usb_ep0_reinit(usb_dev);
+
+        /* Set new (authenticated) address. */
+        result = usb_control_msg(usb_dev, usb_sndctrlpipe(usb_dev, 0),
+                                 USB_REQ_SET_ADDRESS, 0,
+                                 new_address, 0, NULL, 0,
+                                 1000 /* FIXME: arbitrary */);
+        if (result < 0) {
+                dev_err(dev, "auth failed: can't set address %u: %d\n",
+                        new_address, result);
+                goto error_addr;
+        }
+        result = wusb_set_dev_addr(wusbhc, wusb_dev, new_address);
+        if (result < 0)
+                goto error_addr;
+        usb_ep0_reinit(usb_dev);
+        usb_dev->authenticated = 1;
+error_addr:
+error_addr0:
+        return result;
+}
+
+/*
+ *
+ *
+ */
+/* FIXME: split and cleanup */
+int wusb_dev_4way_handshake(struct wusbhc *wusbhc, struct wusb_dev *wusb_dev,
+                            struct wusb_ckhdid *ck)
+{
+        int result = -ENOMEM;
+        struct usb_device *usb_dev = wusb_dev->usb_dev;
+        struct device *dev = &usb_dev->dev;
+        u32 tkid;
+        __le32 tkid_le;
+        struct usb_handshake *hs;
+        struct aes_ccm_nonce ccm_n;
+        u8 mic[8];
+        struct wusb_keydvt_in keydvt_in;
+        struct wusb_keydvt_out keydvt_out;
+
+        hs = kzalloc(3*sizeof(hs[0]), GFP_KERNEL);
+        if (hs == NULL) {
+                dev_err(dev, "can't allocate handshake data\n");
+                goto error_kzalloc;
+        }
+
+        /* We need to turn encryption before beginning the 4way
+         * hshake (WUSB1.0[.3.2.2]) */
+        result = wusb_dev_set_encryption(usb_dev, 1);
+        if (result < 0)
+                goto error_dev_set_encryption;
+
+        tkid = wusbhc_next_tkid(wusbhc, wusb_dev);
+        tkid_le = cpu_to_le32(tkid);
+
+        hs[0].bMessageNumber = 1;
+        hs[0].bStatus = 0;
+        memcpy(hs[0].tTKID, &tkid_le, sizeof(hs[0].tTKID));
+        hs[0].bReserved = 0;
+        memcpy(hs[0].CDID, &wusb_dev->cdid, sizeof(hs[0].CDID));
+        get_random_bytes(&hs[0].nonce, sizeof(hs[0].nonce));
+        memset(hs[0].MIC, 0, sizeof(hs[0].MIC));        /* Per WUSB1.0[T7-22] */
+
+        d_printf(1, dev, "I: sending hs1:\n");
+        hs_printk(2, dev, &hs[0]);
+
+        result = usb_control_msg(
+                usb_dev, usb_sndctrlpipe(usb_dev, 0),
+                USB_REQ_SET_HANDSHAKE,
+                USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+                1, 0, &hs[0], sizeof(hs[0]), 1000 /* FIXME: arbitrary */);
+        if (result < 0) {
+                dev_err(dev, "Handshake1: request failed: %d\n", result);
+                goto error_hs1;
+        }
+
+        /* Handshake 2, from the device -- need to verify fields */
+        result = usb_control_msg(
+                usb_dev, usb_rcvctrlpipe(usb_dev, 0),
+                USB_REQ_GET_HANDSHAKE,
+                USB_DIR_IN | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+                2, 0, &hs[1], sizeof(hs[1]), 1000 /* FIXME: arbitrary */);
+        if (result < 0) {
+                dev_err(dev, "Handshake2: request failed: %d\n", result);
+                goto error_hs2;
+        }
+        d_printf(1, dev, "got HS2:\n");
+        hs_printk(2, dev, &hs[1]);
+
+        result = -EINVAL;
+        if (hs[1].bMessageNumber != 2) {
+                dev_err(dev, "Handshake2 failed: bad message number %u\n",
+                        hs[1].bMessageNumber);
+                goto error_hs2;
+        }
+        if (hs[1].bStatus != 0) {
+                dev_err(dev, "Handshake2 failed: bad status %u\n",
+                        hs[1].bStatus);
+                goto error_hs2;
+        }
+        if (memcmp(hs[0].tTKID, hs[1].tTKID, sizeof(hs[0].tTKID))) {
+                dev_err(dev, "Handshake2 failed: TKID mismatch "
+                        "(#1 0x%02x%02x%02x vs #2 0x%02x%02x%02x)\n",
+                        hs[0].tTKID[0], hs[0].tTKID[1], hs[0].tTKID[2],
+                        hs[1].tTKID[0], hs[1].tTKID[1], hs[1].tTKID[2]);
+                goto error_hs2;
+        }
+        if (memcmp(hs[0].CDID, hs[1].CDID, sizeof(hs[0].CDID))) {
+                dev_err(dev, "Handshake2 failed: CDID mismatch\n");
+                goto error_hs2;
+        }
+
+        /* Setup the CCM nonce */
+        memset(&ccm_n.sfn, 0, sizeof(ccm_n.sfn));       /* Per WUSB1.0[6.5.2] */
+        memcpy(ccm_n.tkid, &tkid_le, sizeof(ccm_n.tkid));
+        ccm_n.src_addr = wusbhc->uwb_rc->uwb_dev.dev_addr;
+        ccm_n.dest_addr.data[0] = wusb_dev->addr;
+        ccm_n.dest_addr.data[1] = 0;
+
+        /* Derive the KCK and PTK from CK, the CCM, H and D nonces */
+        memcpy(keydvt_in.hnonce, hs[0].nonce, sizeof(keydvt_in.hnonce));
+        memcpy(keydvt_in.dnonce, hs[1].nonce, sizeof(keydvt_in.dnonce));
+        result = wusb_key_derive(&keydvt_out, ck->data, &ccm_n, &keydvt_in);
+        if (result < 0) {
+                dev_err(dev, "Handshake2 failed: cannot derive keys: %d\n",
+                        result);
+                goto error_hs2;
+        }
+        d_printf(2, dev, "KCK:\n");
+        d_dump(2, dev, keydvt_out.kck, sizeof(keydvt_out.kck));
+        d_printf(2, dev, "PTK:\n");
+        d_dump(2, dev, keydvt_out.ptk, sizeof(keydvt_out.ptk));
+
+        /* Compute MIC and verify it */
+        result = wusb_oob_mic(mic, keydvt_out.kck, &ccm_n, &hs[1]);
+        if (result < 0) {
+                dev_err(dev, "Handshake2 failed: cannot compute MIC: %d\n",
+                        result);
+                goto error_hs2;
+        }
+
+        d_printf(2, dev, "MIC:\n");
+        d_dump(2, dev, mic, sizeof(mic));
+        if (memcmp(hs[1].MIC, mic, sizeof(hs[1].MIC))) {
+                dev_err(dev, "Handshake2 failed: MIC mismatch\n");
+                goto error_hs2;
+        }
+
+        /* Send Handshake3 */
+        hs[2].bMessageNumber = 3;
+        hs[2].bStatus = 0;
+        memcpy(hs[2].tTKID, &tkid_le, sizeof(hs[2].tTKID));
+        hs[2].bReserved = 0;
+        memcpy(hs[2].CDID, &wusb_dev->cdid, sizeof(hs[2].CDID));
+        memcpy(hs[2].nonce, hs[0].nonce, sizeof(hs[2].nonce));
+        result = wusb_oob_mic(hs[2].MIC, keydvt_out.kck, &ccm_n, &hs[2]);
+        if (result < 0) {
+                dev_err(dev, "Handshake3 failed: cannot compute MIC: %d\n",
+                        result);
+                goto error_hs2;
+        }
+
+        d_printf(1, dev, "I: sending hs3:\n");
+        hs_printk(2, dev, &hs[2]);
+
+        result = usb_control_msg(
+                usb_dev, usb_sndctrlpipe(usb_dev, 0),
+                USB_REQ_SET_HANDSHAKE,
+                USB_DIR_OUT | USB_TYPE_STANDARD | USB_RECIP_DEVICE,
+                3, 0, &hs[2], sizeof(hs[2]), 1000 /* FIXME: arbitrary */);
+        if (result < 0) {
+                dev_err(dev, "Handshake3: request failed: %d\n", result);
+                goto error_hs3;
+        }
+
+        d_printf(1, dev, "I: turning on encryption on host for device\n");
+        d_dump(2, dev, keydvt_out.ptk, sizeof(keydvt_out.ptk));
+        result = wusbhc->set_ptk(wusbhc, wusb_dev->port_idx, tkid,
+                                 keydvt_out.ptk, sizeof(keydvt_out.ptk));
+        if (result < 0)
+                goto error_wusbhc_set_ptk;
+
+        d_printf(1, dev, "I: setting a GTK\n");
+        result = wusb_dev_set_gtk(wusbhc, wusb_dev);
+        if (result < 0) {
+                dev_err(dev, "Set GTK for device: request failed: %d\n",
+                        result);
+                goto error_wusbhc_set_gtk;
+        }
+
+        /* Update the device's address from unauth to auth */
+        if (usb_dev->authenticated == 0) {
+                d_printf(1, dev, "I: updating addres to auth from non-auth\n");
+                result = wusb_dev_update_address(wusbhc, wusb_dev);
+                if (result < 0)
+                        goto error_dev_update_address;
+        }
+        result = 0;
+        d_printf(1, dev, "I: 4way handshke done, device authenticated\n");
+
+error_dev_update_address:
+error_wusbhc_set_gtk:
+error_wusbhc_set_ptk:
+error_hs3:
+error_hs2:
+error_hs1:
+        memset(hs, 0, 3*sizeof(hs[0]));
+        memset(&keydvt_out, 0, sizeof(keydvt_out));
+        memset(&keydvt_in, 0, sizeof(keydvt_in));
+        memset(&ccm_n, 0, sizeof(ccm_n));
+        memset(mic, 0, sizeof(mic));
+        if (result < 0) {
+                /* error path */
+                wusb_dev_set_encryption(usb_dev, 0);
+        }
+error_dev_set_encryption:
+        kfree(hs);
+error_kzalloc:
+        return result;
+}
+
+/*
+ * Once all connected and authenticated devices have received the new
+ * GTK, switch the host to using it.
+ */
+static void wusbhc_gtk_rekey_done_work(struct work_struct *work)
+{
+        struct wusbhc *wusbhc = container_of(work, struct wusbhc, gtk_rekey_done_work);
+        size_t key_size = sizeof(wusbhc->gtk.data);
+
+        mutex_lock(&wusbhc->mutex);
+
+        if (--wusbhc->pending_set_gtks == 0)
+                wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size);
+
+        mutex_unlock(&wusbhc->mutex);
+}
+
+static void wusbhc_set_gtk_callback(struct urb *urb)
+{
+        struct wusbhc *wusbhc = urb->context;
+
+        queue_work(wusbd, &wusbhc->gtk_rekey_done_work);
+}
+
+/**
+ * wusbhc_gtk_rekey - generate and distribute a new GTK
+ * @wusbhc: the WUSB host controller
+ *
+ * Generate a new GTK and distribute it to all connected and
+ * authenticated devices.  When all devices have the new GTK, the host
+ * starts using it.
+ *
+ * This must be called after every device disconnect (see [WUSB]
+ * section 6.2.11.2).
+ */
+void wusbhc_gtk_rekey(struct wusbhc *wusbhc)
+{
+        static const size_t key_size = sizeof(wusbhc->gtk.data);
+        int p;
+
+        wusbhc_generate_gtk(wusbhc);
+
+        for (p = 0; p < wusbhc->ports_max; p++) {
+                struct wusb_dev *wusb_dev;
+
+                wusb_dev = wusbhc->port[p].wusb_dev;
+                if (!wusb_dev || !wusb_dev->usb_dev | !wusb_dev->usb_dev->authenticated)
+                        continue;
+
+                usb_fill_control_urb(wusb_dev->set_gtk_urb, wusb_dev->usb_dev,
+                                     usb_sndctrlpipe(wusb_dev->usb_dev, 0),
+                                     (void *)wusb_dev->set_gtk_req,
+                                     &wusbhc->gtk.descr, wusbhc->gtk.descr.bLength,
+                                     wusbhc_set_gtk_callback, wusbhc);
+                if (usb_submit_urb(wusb_dev->set_gtk_urb, GFP_KERNEL) == 0)
+                        wusbhc->pending_set_gtks++;
+        }
+        if (wusbhc->pending_set_gtks == 0)
+                wusbhc->set_gtk(wusbhc, wusbhc->gtk_tkid, &wusbhc->gtk.descr.bKeyData, key_size);
+}